Low-loss planar inductor

Abstract

The utility model relates to the technical field of planar inductors, and discloses a low-loss planar inductor which comprises a packaging shell, a magnetic core and a flat coil, a circular shell is installed in the packaging shell, and the magnetic core is arranged in the circular shell; side sealing plates are welded to the two ends of the circular shell. According to the low-loss planar inductor, the design that the flat coil is wound around the surface of the magnetic core is adopted, high-frequency loss can be reduced, the skin effect and the proximity effect are effectively restrained, copper loss and magnetic loss are reduced, low loss of the planar inductor is guaranteed, meanwhile, silicone rubber is encapsulated in the space formed by combining the limiting plates, and the overall performance of the planar inductor is improved. The first gasket, the filling block and the mounting groove are made of polyurethane materials, the vibration sense of the planar inductor can be reduced, the stability of the magnetic core structure is enhanced, mechanical damage of the planar inductor is reduced, the low-loss performance of the planar inductor is further improved, meanwhile, the second gasket is arranged between the inductor and the circuit board, and the risk that welding spots of pins crack due to vibration is reduced.

Description

Technical Field

[0001] This utility model relates to the field of planar inductor technology, specifically a low-loss planar inductor. Background Technology

[0002] Planar inductors are inductor devices manufactured using planar technology. Their core structure consists of a coil and a magnetic core (or no magnetic core). They are characterized by being ultra-thin, compact, and easy to integrate. Compared to traditional wire-wound inductors (such as toroidal and cylindrical inductors), planar inductors significantly reduce height through planar design, making them suitable for the miniaturization and lightweight requirements of modern electronic devices. They are widely used in consumer electronics, automotive electronics, communication equipment, and other fields.

[0003] When in use, planar inductors are affected by various external vibration sources, such as equipment movement and mechanical vibration. For planar inductors, vibration may cause problems such as displacement and loosening of their internal structure, which in turn affects the performance of the inductor, increases losses, and reduces the stability and reliability of electronic devices. At present, some planar inductors lack effective vibration reduction design, or the vibration reduction structure is complex and costly, which cannot meet the needs of practical applications.

[0004] Therefore, it is necessary to propose a low-loss planar inductor. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a low-loss planar inductor that effectively reduces the impact of vibration on the internal structure of the planar inductor, ensuring its normal operation and solving the problems mentioned in the background art.

[0006] This utility model provides the following technical solution: a low-loss planar inductor, comprising a package housing, a magnetic core, and a flat coil:

[0007] A circular shell is installed inside the encapsulation housing, and a magnetic core is disposed inside the circular shell;

[0008] The circular shell has side sealing plates welded to both ends. A hollow tube is fixedly connected to the inner side of the side sealing plates. A gasket is installed on one side of the hollow tube. A connector is installed on the other side of the gasket. The outer surface of the connector is movably connected to the other end of the hollow tube. The magnetic core has mating grooves on both sides. The outer surface of the end of the connector is inserted into the inside of the mating groove.

[0009] Preferably, the inner two sides of the circular shell are fixedly connected to limit plates, the outer surfaces of both ends of the magnetic core are in contact with the inside of the limit plates, and silicone rubber is potted between the two sets of limit plates.

[0010] Preferably, a flat coil is wound on the outer surface of the magnetic core, and pins are welded to both ends of the flat coil.

[0011] Preferably, the two ends of the encapsulation shell and the circular shell are respectively provided with slot two and slot one, and a filling block is installed inside slot two and slot one.

[0012] Preferably, pins are inserted inside the second slot and the first slot, and the inside of the filling block is bonded and wrapped with the outer surface of the pins.

[0013] Preferably, the external size of the side sealing plate is the same as the internal size of the circular shell, and the lower surface of the encapsulation shell is provided with an installation groove, and a second gasket is installed inside the installation groove. The first gasket and the second gasket are made of polyurethane material.

[0014] Preferably, the filler block is made of polyurethane material.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This low-loss planar inductor, through its design of using flat coils wound on the surface of the magnetic core, reduces high-frequency losses, effectively suppresses skin and proximity effects, reduces copper and magnetic losses, and ensures the low loss of the planar inductor. At the same time, the space within the limiting plate assembly is encapsulated with silicone rubber, and the first gasket, filler block, and mounting groove are made of polyurethane material, which can reduce the vibration of the planar inductor, enhance the stability of the magnetic core structure, reduce its mechanical damage, and further improve its low-loss performance. Meanwhile, the second gasket is placed between the inductor and the circuit board, reducing the risk of the pin solder joints cracking due to vibration and ensuring its normal operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model;

[0019] Figure 2 This utility model Figure 1 Partial cross-sectional structural schematic diagram;

[0020] Figure 3 This utility model Figure 1 Schematic diagram of the side section structure;

[0021] Figure 4This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Encapsulation housing; 110. Circular housing; 111. Hollow tube; 112. Gasket 1; 113. Connector; 114. Side sealing plate; 120. Mounting groove; 121. Gasket 2;

[0024] 2. Magnetic core; 210. Flat coil; 220. Connecting slot; 230. Lead;

[0025] 3. Limit plate;

[0026] 4. Filler block; 410. Slot 1; 420. Slot 2. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 A low-loss planar inductor includes a package housing 1, a magnetic core 2, and a flat coil 210.

[0029] A circular housing 110 is installed inside the encapsulation housing 1, and a magnetic core 2 is disposed inside the circular housing 110;

[0030] The two ends of the circular shell 110 are welded with side sealing plates 114. A hollow tube 111 is fixedly connected to the inner side of the side sealing plate 114. A gasket 112 is installed on one side of the hollow tube 111. A connector 113 is installed on the other side of the gasket 112. The outer surface of the connector 113 is movably connected to the other end of the hollow tube 111. The magnetic core 2 has mating grooves 220 on both sides. The outer surface of the end of the connector 113 is inserted into the inside of the mating groove 220. A flat coil 210 is wound on the outer surface of the magnetic core 2. The two ends of the flat coil 210 are welded with pins 230.

[0031] The design of using a flat coil 210 wound on the surface of the magnetic core 2 can reduce high-frequency loss, effectively suppress skin effect and proximity effect, reduce copper loss and magnetic loss, and ensure low loss of planar inductor. At the same time, the pad 112 is made of polyurethane material, which can effectively reduce the impact of vibration on the magnetic core 2 assembly and ensure its normal operation.

[0032] As a preferred technical solution of this utility model, the inner two sides of the circular shell 110 are fixedly connected to the limiting plate 3, the outer surfaces of both ends of the magnetic core 2 are in contact with the inside of the limiting plate 3, and silicone rubber is potted between the two sets of limiting plates 3.

[0033] Encapsulating the space between the limiting plates 3 with silicone rubber can fill the internal gaps, fix the magnetic core 2 and the flat coil 210, reduce collisions between components, and, combined with the aforementioned gasket 112, further reduce the impact of vibration.

[0034] As a preferred technical solution of this utility model, the two ends of the encapsulation shell 1 and the circular shell 110 are respectively provided with a second slot 420 and a first slot 410. A filler block 4 is installed inside the second slot 420 and the first slot 410. A pin 230 is inserted inside the second slot 420 and the first slot 410. The inside of the filler block 4 is bonded and wrapped with the outer surface of the pin 230. The filler block 4 is made of polyurethane material.

[0035] The portion of pin 230 that contacts the package housing 1 and the circular housing 110 is wrapped with a filler block 4 made of polyurethane material. This can reduce the collision between pin 230 and the package housing 1 and the circular housing 110 caused by vibration, ensure the integrity of pin 230 and avoid mechanical damage.

[0036] As a preferred technical solution of this utility model, the external size of the side sealing plate 114 is the same as the internal size of the circular shell 110. The lower surface of the encapsulation shell 1 is provided with a mounting groove 120, and a second gasket 121 is installed inside the mounting groove 120. The first gasket 112 and the second gasket 121 are made of polyurethane material.

[0037] The second pad 121 is placed between the inductor and the circuit board to reduce the risk of the solder joints of pin 230 cracking due to vibration and ensure its normal operation.

[0038] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-loss planar inductor, comprising a package housing (1), a magnetic core (2), and a flat coil (210), characterized in that: A circular shell (110) is installed inside the encapsulation shell (1), and a magnetic core (2) is disposed inside the circular shell (110); The circular shell (110) has side sealing plates (114) welded to both ends. A hollow tube (111) is fixedly connected to the inner side of the side sealing plate (114). A gasket (112) is installed on one side of the hollow tube (111). A connector (113) is installed on the other side of the gasket (112). The outer surface of the connector (113) is movably connected to the other end of the hollow tube (111). The magnetic core (2) has mating grooves (220) on both sides. The outer surface of the end of the connector (113) is inserted into the inside of the mating groove (220).

2. A low-loss planar inductor according to claim 1, characterized in that: Both sides of the inner side of the circular shell (110) are fixedly connected to the limiting plate (3), the outer surfaces of both ends of the magnetic core (2) are in contact with the inside of the limiting plate (3), and silicone rubber is potted between the two sets of limiting plates (3).

3. A low-loss planar inductor as claimed in claim 1, characterized in that: A flat coil (210) is wound on the outer surface of the magnetic core (2), and pins (230) are welded to both ends of the flat coil (210).

4. A low-loss planar inductor as claimed in claim 1, characterized in that: The two ends of the encapsulation shell (1) and the circular shell (110) are respectively provided with slot two (420) and slot one (410), and filling blocks (4) are installed inside the slot two (420) and slot one (410).

5. A low-loss planar inductor according to claim 4, characterized in that: Pins (230) are inserted inside the slots 2 (420) and 1 (410), and the inside of the filling block (4) is bonded and wrapped to the outer surface of the pins (230).

6. A low-loss planar inductor as recited in claim 1, characterized by: The external size of the side sealing plate (114) is the same as the internal size of the circular shell (110). The lower surface of the encapsulation shell (1) is provided with a mounting groove (120). A second gasket (121) is installed inside the mounting groove (120). The first gasket (112) and the second gasket (121) are made of polyurethane material.

7. A low-loss planar inductor as claimed in claim 4, characterized in that: The filler block (4) is made of polyurethane material.

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